Muffler manifold



E. R. HEWITT ET AL May 27, 1930.

MUFFLER MANIFOLD Filed May 29, 1928 Snowntow Edward Faisal/did William 5- J97) Patented May 27, 1930 N. Y., A CQRPORATION OF DELAWARE EDWARD R. HEWITT, F MIDVALE, NEW JERSE YORK, Y., ASSIGNORS T0 INTERNATIU MUFFLER MANIFOLD Application filed may 29,

The present invention relates to manifolds for internal combustion engines and has to do particularly with those manifolds which i are designed to mufie exhaust explosions and reduce the resulting noise in the exhaust line as well as that transmitted through the metallic parts of the engine and associated mechanism.

The manifold embodying the present in- ]o vention is formed with air pockets which are designed to-set up wave impulses which destroy the direct impulses from the exhaust gases. These destructive impulses are produced by reflecting direct impulses from the exhaust gases from the air pocket and com bining the reflected waves wit-h the direct waves in such manner that the vibrations of one destroy those of the other. It will be understood, of course, that the length of the pocket must be suflicient to cause the path of the reflected impulses to be such that the nodes of the reflected gases will be out of phase with those of the direct gases.

It is further proposed to form the manifold with suitable baffling means to cause the path of all of the exhaust gases within the manifold to be restricted ina m nner to cause the wave impulses from the, several exhausts to destroy one another to as great an extent as possible.

The manifold embodying the present invention is formed of generally tubular shape and provided with air pockets at either end. The inlet ports are situated so that the gases which they introduce into the manifold are bafiled before reaching the exhaust port. The specific form and assembly of elements will be understood more fully in connection with 40 the accompanying drawings, wherein:

Figure 1 is a plan view, partly broken away and in section, showing a manifold constructed in accordance with the present invention.

Figure 2 is a side elevation, partly broken wall of the manifold. This 1928. Serial No. 281,504.

showing the mufier -large. In the present embodiment, the manifold has been shown as constructed in two sections and joined together as at c. The exhaust port for the manifold is shown at a? and may be located at any desirable point in its length, subject only to the. structural limitations imposed by the bafie which will so be described later,

At either end of the manifold, a cap-shaped closure 6 has been provided. Threaded arms 0 are secured to the manifold and receive nuts 0 which serve to adjust the position of the cap 6 wit-h respect to the manifold c. The cap e is provided with suitable flanges 6 against which the nuts 0 engage and adjusting of the nuts with respect to the threaded arms 0' causes the length oft-he air pocket to be varied. It will be obvious, that having once ascertained the proper depth of air pocket, the manifold and caps can be constructed as a unit, the latter being formed with the former. i v 76 Extending from the left end of the manifold, and for a portion of its length, is a horizontal bafile plate f which is shown as perforated along its horizontal tion as indicated at 7. These per tions permit a limited quantity of exhaust". gases to pass through the plate and at the same time preserve its character as a 'bafile for the gases. The ba'flle plate terminates in an upwardly extending tongue-85 shaped extension F, the edges of which are formed to provide about a quarter of an inch clearance between the extension and the clearance extends around the entire edge of the extenfii 80 i 1 these elements may be varied to accommodate the individual requirements of various designs.

The noise emanating from the exhaust impulses, particularly at higher engine speeds, is greatly reduced by reason of the destructive wave impulses reflected by the air pockets formed by the capsat either. end of the manifold as well as the bafiing of the gases by the plate f and extension f". The restriction of the flow of gases by this plate and extension causes them to travel by various paths and thus use up some of the energy which causes noise as well as tend to destroy the wave impulses of the gases in confiicting paths.

As an added feature of the inventionit has been discovered by experience that the above manifold has resulted in a lower temperature under the exhaust valves. This temperature has been lowered from 300 to 400 Fahrenheit and the engine performance has been improved materially. The lower temperature enables a higher compression to be obtained with a correspondingly eater development of power from the engine. As an additional advantage, the valves have a greater life and the necessity of regrinding them in considerably reduced.

Although the invention has been described with respect to the accompanyin drawings, it is not to be limited save as de ed in the appended claims. v

' We claim as our invention a 1. A mufller manifold having an exhaust port and a plurality of inlet ports, a tubular chamber, a pocket formed at one end of the chamber, a single erforated baflie forming a longitudinal partition for a ortion of the length of the chamber, and a ent extension on the baflie formin ,.with the walls of the chamber,- a restricte portion through which part of the exhaust gases pass.

2. A mufiler manifold having an exhaust port and a plurality of inlet ports, a tubular chamber, and a single lon -tu'dinally extending battle in the chem er om one end to the middle thereof.

3. A mufller manifold having an exhaust port and a plurality of inlet ports, a tubular chamber, and a sin 1e, longitudinally extending bafllein the c amber from one end to the middle thereof and substantiallly parallel te and in front of the face of the exhaust ort. P 4-. A mufiler manifold having an exhaust port and a plurality of inlet ports, a tubular chamber, a single longitudinally extending perforated bafie in the chamber, and a bent extension on the baflie terminating short of and cooperating with the sides of the chamher to form a restricted passage between the extension and sides to baffle the gases.

This specification signed this 17th day of May A. D. 1928.

' EDWARD R. HEWITT.

WILLIAM B. JUPP. 

